/Engine/Plugins/Online/OnlineSubsystem/Source/Public/Interfaces/OnlineFriendsInterface.h
Delegate called when a remote friend removes user from friends list
typedef TMulticastDelegate_TwoParams< void, const [FUniqueNetId](API\Runtime\CoreOnline\Online\FUniqueNetId) &, const [FUniqueNetId](API\Runtime\CoreOnline\Online\FUniqueNetId) & > FOnFriendRemoved